Incredible link. Thanks for posting it. It's wonderful they got good photos of this.
I suspect you're Spot On about this just being a mere glimpse of what is underground. Tyberonn has said there are Earth crystals the size of skyscrapers.

I couldn't help but think about Tyberonn's (Jim Tipton) messages about the giant Earth crystals. Some of Tyberonn’s messages about the giant Earth crystals.

http://spiritlibrary.com/earth-keepe...fall-of-atlant

http://spiritlibrary.com/earth-keepe...crystal-vortex

http://spiritlibrary.com/earth-keepe...eld-of-10-10-1

As they say, a pic is worth 1000 words. Pics from the above link.